Can you think of any three-dimensional shape that comprises of exactly two surfaces?

When can we add 2 to 11 and get 1 as the correct answer?

In Greek mythology, the Sphinx sat outside of Thebes and asked this riddle of all travellers who passed by. If the traveller failed to solve the riddle, then the Sphinx killed him/her. And if the traveller answered the riddle correctly, then the Sphinx would destroy herself. The riddle:

What goes on four legs in the morning, on two legs at noon, and on three legs in the evening?

Oedipus solved the riddle, and the Sphinx destroyed herself.

What Adam and Eve do not have but the rest of the people have?

In four steps you need to move the word 'cold' From 'warm' by replacing one alphabet at a time such that every word formed at each step is acceptable in English Dictionary.

Can you complete the sequence?

192, 021, 222, 324, 252, 627, 2__, 9__?

An artist while painting a scenic beauty, decides to paint three layers of blue colour on the sky.

Which layer will go on the first?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

Replace the question mark with the correct number.

2 + 2= 4
3 + 3= 18
4 + 4= 48
5 + 5= ?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?